"or can it be ATA 3, or ATA 4, Ultra, etc.? "
Yes. ATA 4 drives work in ATA 3 and before controllers. If they didn't... havoc would be thy name.
I must replace the hard drive in my IBM i1412 laptop. The drive being replaced is marked "ATA/IDE." Question: Must the replacement drive be ?ATA/IDE? as well, or can it be ATA 3, or ATA 4, Ultra, etc.? Finding a replacement drive described as simply ?ATA/IDE? has been difficult. I?m unable to determine if my motherboard supports any of the variant interfaces.